/* ToolNest — design system. Palette: "Deep Pine" (validated 20/20). Flat colors only, no gradients. */
:root{
  --bg:#EFF6E0; --surface:#FFFFFF; --surface-2:#F6FAF0;
  --border:#D3E1C4; --border-strong:#B9CCA5;
  --text:#01161E; --muted:#49584F;
  --accent:#124559; --accent-ink:#FFFFFF; --accent-soft:#E2EDD3; --link:#124559;
  --success:#1F6B2E; --warning:#7A5A00; --error:#B5031C; --info:#0B4F79;
  --shadow:0 1px 2px rgba(1,22,30,.05),0 8px 24px -12px rgba(1,22,30,.18);
  --shadow-sm:0 1px 2px rgba(1,22,30,.06);
  --radius:14px; --radius-sm:10px; --maxw:1080px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
html[data-theme="dark"]{
  --bg:#0B1416; --surface:#12211F; --surface-2:#172826;
  --border:#24352F; --border-strong:#33483F;
  --text:#E8F1E6; --muted:#9CB0A4;
  --accent:#7FC0CE; --accent-ink:#06282E; --accent-soft:#173034; --link:#7FC0CE;
  --success:#7FD69A; --warning:#E4B75E; --error:#F2A0A0; --info:#8FC6EE;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -14px rgba(0,0,0,.6);
  --shadow-sm:0 1px 2px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);
  line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
h1,h2,h3{line-height:1.2;letter-spacing:-.015em;margin:0 0 .4em;font-weight:680}
h1{font-size:clamp(1.75rem,4vw,2.5rem)}
h2{font-size:clamp(1.35rem,2.6vw,1.75rem)}
h3{font-size:1.15rem}
p{margin:0 0 1rem}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.tnum{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.muted{color:var(--muted)}
.small{font-size:.875rem}
.center{text-align:center}
.skip{position:absolute;left:-9999px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;gap:18px;height:60px}
.brand{display:flex;align-items:center;gap:9px;font-weight:750;font-size:1.15rem;color:var(--text);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand .logo{width:26px;height:26px;flex:none}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav a{padding:8px 11px;border-radius:9px;color:var(--muted);font-size:.92rem;font-weight:550}
.nav a:hover{background:var(--accent-soft);color:var(--text);text-decoration:none}
.nav a[aria-current="page"]{color:var(--text);background:var(--accent-soft)}
.hbtn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;min-width:36px;
  border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:9px;cursor:pointer;
  font:inherit;font-size:.85rem;font-weight:650;padding:0 10px}
.hbtn:hover{border-color:var(--border-strong)}
.hbtn svg{width:17px;height:17px}
.menu-toggle{display:none}

/* Hero */
.hero{padding:64px 0 40px;text-align:center}
.hero h1{max-width:15ch;margin:0 auto .5rem}
.hero .lead{font-size:1.15rem;color:var(--muted);max-width:56ch;margin:0 auto 1.6rem}
.search-wrap{max-width:520px;margin:0 auto;position:relative}
.search-wrap input{width:100%;height:52px;padding:0 16px 0 44px;border:1px solid var(--border-strong);
  border-radius:12px;background:var(--surface);color:var(--text);font:inherit;font-size:1rem;box-shadow:var(--shadow-sm)}
.search-wrap input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.search-wrap svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:19px;height:19px;color:var(--muted)}
.search-hint{margin-top:.75rem;font-size:.85rem;color:var(--muted)}

/* Section */
.section{padding:32px 0}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:18px}
.section-head h2{margin:0}
.eyebrow{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--accent)}

/* Tool grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.card{display:flex;gap:13px;padding:16px;height:100%;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);color:var(--text);transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--border-strong);transform:translateY(-2px);text-decoration:none}
.card .ico{width:40px;height:40px;flex:none;border-radius:10px;background:var(--accent-soft);
  display:flex;align-items:center;justify-content:center;color:var(--accent)}
.card .ico svg{width:21px;height:21px}
.card h3{font-size:1rem;margin:0 0 2px}
.card p{margin:0;font-size:.86rem;color:var(--muted);line-height:1.45}

/* Breadcrumb */
.crumbs{display:flex;gap:6px;flex-wrap:wrap;font-size:.85rem;color:var(--muted);padding-top:22px}
.crumbs a{color:var(--muted)}
.crumbs span{opacity:.6}

/* Tool page */
.tool-head{padding:20px 0 6px}
.tool-head .eyebrow{margin-bottom:6px}
.tool-head h1{margin-bottom:.35rem}
.tool-head .sub{color:var(--muted);font-size:1.05rem;max-width:62ch;margin:0}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start;padding-bottom:12px}
@media(max-width:860px){.tool-layout{grid-template-columns:1fr}}

/* Calculator panel */
.calc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px}
.calc h2{font-size:1.1rem;margin-bottom:16px}
.field{margin-bottom:15px}
.field:last-child{margin-bottom:0}
.field label{display:block;font-size:.88rem;font-weight:600;margin-bottom:6px;color:var(--text)}
.field .hint{font-size:.8rem;color:var(--muted);font-weight:400;margin-left:6px}
input[type="number"],input[type="text"],input[type="date"],select,textarea{
  width:100%;height:44px;padding:0 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  background:var(--surface-2);color:var(--text);font:inherit;font-size:1rem;font-variant-numeric:tabular-nums}
textarea{height:auto;min-height:150px;padding:12px;resize:vertical;line-height:1.5}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent);background:var(--surface)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
@media(max-width:520px){.row,.row-3{grid-template-columns:1fr}}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;width:100%;height:48px;
  padding:0 18px;border:0;border-radius:var(--radius-sm);background:var(--accent);color:var(--accent-ink);
  font:inherit;font-size:1rem;font-weight:680;cursor:pointer;transition:filter .15s}
.btn:hover{filter:brightness(1.08)}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:var(--surface-2);color:var(--text);border:1px solid var(--border-strong)}
.btn.ghost:hover{background:var(--accent-soft)}
.btn.sm{height:40px;font-size:.9rem;width:auto}

/* segmented control */
.seg{display:flex;gap:6px;background:var(--surface-2);border:1px solid var(--border);padding:4px;border-radius:var(--radius-sm);margin-bottom:16px;flex-wrap:wrap}
.seg button{flex:1;min-width:80px;height:36px;border:0;border-radius:8px;background:transparent;color:var(--muted);
  font:inherit;font-size:.88rem;font-weight:600;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm)}

/* result */
.result{margin-top:18px;padding:18px;border-radius:var(--radius-sm);background:var(--accent-soft);
  border:1px solid var(--border-strong)}
.result .big{font-size:clamp(1.8rem,5vw,2.6rem);font-weight:750;letter-spacing:-.02em;color:var(--text);
  line-height:1.1;font-variant-numeric:tabular-nums}
.result .label{font-size:.85rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.result .breakdown{margin-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:8px 18px;font-size:.92rem}
.result .breakdown div{display:flex;justify-content:space-between;gap:10px;border-top:1px dashed var(--border-strong);padding-top:6px}
.result .breakdown b{font-variant-numeric:tabular-nums}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.8rem;font-weight:700}
.badge.ok{background:rgba(31,107,46,.12);color:var(--success)}
.badge.warn{background:rgba(122,90,0,.12);color:var(--warning)}
.badge.bad{background:rgba(181,3,28,.12);color:var(--error)}
.badge.info{background:rgba(11,79,121,.12);color:var(--info)}
/* force badge colors readable on dark */
html[data-theme="dark"] .badge.ok{background:rgba(127,214,154,.16)}
html[data-theme="dark"] .badge.warn{background:rgba(228,183,94,.16)}
html[data-theme="dark"] .badge.bad{background:rgba(242,160,160,.16)}
html[data-theme="dark"] .badge.info{background:rgba(143,198,238,.16)}

/* ads */
.ad-slot{margin:18px 0;min-height:100px;border:1px dashed var(--border-strong);border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.78rem;
  letter-spacing:.06em;text-transform:uppercase;background:var(--surface-2)}
.ad-slot.rail{min-height:250px}

/* content */
.prose{max-width:none;padding:8px 0 8px}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.3em}
.prose ul,.prose ol{padding-left:1.2rem}
.prose li{margin-bottom:.4rem}
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;position:relative;padding-left:38px;margin-bottom:14px}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:26px;height:26px;border-radius:50%;
  background:var(--accent);color:var(--accent-ink);font-weight:700;font-size:.85rem;display:flex;align-items:center;justify-content:center}

/* FAQ */
.faq{margin-top:8px}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:640;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--muted);font-weight:400}
.faq details[open] summary::after{content:"\2212"}
.faq details p{margin:10px 0 0;color:var(--muted);font-size:.95rem}

/* sidebar */
.aside-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:16px}
.aside-card h3{font-size:.9rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:10px}
.aside-card ul{list-style:none;margin:0;padding:0}
.aside-card li{margin-bottom:2px}
.aside-card li a{display:block;padding:7px 9px;border-radius:8px;color:var(--text);font-size:.92rem}
.aside-card li a:hover{background:var(--accent-soft);text-decoration:none}
.aside-card .mini{font-size:.82rem;color:var(--muted);line-height:1.5}

/* Footer */
.site-footer{border-top:1px solid var(--border);margin-top:48px;padding:36px 0 40px;background:var(--surface)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
@media(max-width:720px){.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
.footer-brand .brand{font-size:1.05rem;margin-bottom:8px}
.footer-brand p{color:var(--muted);font-size:.88rem;max-width:34ch;margin:0}
.site-footer h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 10px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:6px}
.site-footer a{color:var(--text);font-size:.9rem}
.footer-bottom{margin-top:26px;padding-top:16px;border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:.82rem}

/* misc */
.stack-sm>*+*{margin-top:10px}
.mt0{margin-top:0}
.hidden{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.note{font-size:.82rem;color:var(--muted);margin-top:10px}
.copy-msg{color:var(--success);font-size:.85rem;font-weight:600}
.pw-output{display:flex;gap:10px;align-items:stretch}
.pw-output input{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1.05rem;letter-spacing:.02em}
.chk{display:flex;align-items:center;gap:9px;margin-bottom:10px;font-size:.92rem;cursor:pointer}
.chk input{width:18px;height:18px;accent-color:var(--accent);flex:none}
.range-row{display:flex;align-items:center;gap:14px}
input[type="range"]{flex:1;accent-color:var(--accent);height:6px}
.range-val{font-weight:700;min-width:2.5ch;text-align:right;font-variant-numeric:tabular-nums}
.table{width:100%;border-collapse:collapse;font-size:.92rem}
.table th,.table td{padding:9px 10px;border-bottom:1px solid var(--border);text-align:left}
.table th{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;font-weight:650}
.table td.num{text-align:right;font-variant-numeric:tabular-nums}

@media(max-width:760px){
  .section-head{flex-direction:column;align-items:flex-start;gap:4px}
  .nav{display:none}
  .menu-toggle{display:inline-flex;margin-left:auto}
  .nav.open{display:flex;position:absolute;left:0;right:0;top:60px;flex-direction:column;background:var(--surface);
    border-bottom:1px solid var(--border);padding:10px;gap:2px;margin:0}
  .header-inner{gap:10px}
  .hero{padding:40px 0 24px}
  .ad-slot.rail{min-height:120px}
}

/* ============================================================
   Polish & Motion layer — lightweight, no external libraries.
   Respects prefers-reduced-motion. Flat colors only (no gradients).
   ============================================================ */
:root{--ease:cubic-bezier(.22,.61,.36,1);--ease-out:cubic-bezier(.16,1,.3,1)}
html{scroll-behavior:smooth}
section[id],.tool-head{scroll-margin-top:84px}
body{transition:background-color .35s var(--ease),color .35s var(--ease)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* header on scroll */
.site-header{transition:box-shadow .3s var(--ease),background-color .3s var(--ease),border-color .3s var(--ease)}
.site-header.scrolled{box-shadow:0 8px 30px -18px rgba(1,22,30,.5);border-bottom-color:var(--border-strong)}
html[data-theme="dark"] .site-header.scrolled{box-shadow:0 8px 30px -16px rgba(0,0,0,.7)}
.header-inner{transition:height .25s var(--ease)}
.site-header.scrolled .header-inner{height:54px}

/* theme icons: show only the relevant one */
.icon-moon{display:none}
html[data-theme="dark"] .icon-sun{display:none}
html[data-theme="dark"] .icon-moon{display:block}
[data-theme-toggle] svg{transition:transform .45s var(--ease)}
[data-theme-toggle]:hover svg{transform:rotate(20deg) scale(1.05)}

/* scroll reveal — content stays VISIBLE by default (SEO/crawler safe);
   animation only plays when it enters viewport */
@keyframes revealIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.js [data-reveal].in{animation:revealIn .6s var(--ease-out) both;animation-delay:calc(var(--i,0) * 60ms)}

/* micro: cards */
.card{transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .ico{transition:transform .3s var(--ease),background-color .25s}
.card:hover .ico{transform:scale(1.07) rotate(-4deg)}

/* micro: buttons */
.btn{transition:filter .18s,transform .1s var(--ease),box-shadow .25s var(--ease)}
.btn:hover{box-shadow:0 10px 24px -14px var(--accent)}
.btn:active{transform:translateY(1px) scale(.994)}
.hbtn{transition:border-color .18s,background-color .18s,transform .1s}
.hbtn:active{transform:scale(.95)}
.btn.sm:active{transform:scale(.97)}

/* micro: inputs */
input,select,textarea{transition:border-color .18s,box-shadow .18s,background-color .18s}
input:focus,select:focus,textarea:focus{box-shadow:0 0 0 4px rgba(18,69,89,.12)}
html[data-theme="dark"] input:focus,html[data-theme="dark"] select:focus,html[data-theme="dark"] textarea:focus{box-shadow:0 0 0 4px rgba(127,192,206,.18)}

/* segmented control */
.seg button{transition:background-color .2s var(--ease),color .2s var(--ease),box-shadow .2s}

/* result pulse when values change */
@keyframes resultGlow{0%{box-shadow:inset 0 0 0 0 rgba(18,69,89,.25)}100%{box-shadow:inset 0 0 0 40px rgba(18,69,89,0)}}
.result{transition:background-color .3s var(--ease)}
.result.flash{animation:resultGlow .7s var(--ease)}
@keyframes valPop{0%{transform:scale(.94);opacity:.55}60%{transform:scale(1.015)}100%{transform:none;opacity:1}}
.result.flash .big,.result .big.flash{animation:valPop .4s var(--ease)}

/* mobile menu slide */
@media(max-width:760px){
  .nav.open{animation:menuIn .28s var(--ease-out)}
  .nav a{opacity:0;animation:menuItem .3s var(--ease-out) forwards}
  .nav.open a:nth-child(1){animation-delay:.02s}
  .nav.open a:nth-child(2){animation-delay:.04s}
  .nav.open a:nth-child(3){animation-delay:.06s}
  .nav.open a:nth-child(4){animation-delay:.08s}
  .nav.open a:nth-child(5){animation-delay:.10s}
  .nav.open a:nth-child(6){animation-delay:.12s}
  .nav.open a:nth-child(7){animation-delay:.14s}
}
@keyframes menuIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
@keyframes menuItem{to{opacity:1}}

/* faq answer fade */
.faq details p{animation:fadeUp .3s var(--ease-out)}
@keyframes fadeUp{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.faq details[open]{border-color:var(--border-strong)}

/* hero */
.hero{position:relative;overflow:hidden}
.hero-deco{position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.55;pointer-events:none}
.hero .eyebrow,.hero h1,.hero .lead,.hero .search-wrap,.hero .trust,.hero .stats{position:relative}
.trust{display:flex;gap:14px 24px;justify-content:center;flex-wrap:wrap;margin:22px auto 0;color:var(--muted);font-size:.9rem}
.trust span{display:inline-flex;align-items:center;gap:7px}
.trust svg{width:16px;height:16px;color:var(--accent);flex:none}
.stats{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:26px auto 0;max-width:520px}
.stat{flex:1;min-width:110px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow-sm)}
.stat b{display:block;font-size:1.5rem;font-weight:760;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--text)}
.stat span{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-weight:600}

/* features row */
.features{padding-top:8px}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:760px){.feature-grid{grid-template-columns:1fr}}
.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}
.feature .fico{display:inline-flex;width:42px;height:42px;border-radius:11px;background:var(--accent-soft);color:var(--accent);align-items:center;justify-content:center;margin-bottom:12px}
.feature .fico svg{width:22px;height:22px}
.feature h3{font-size:1.02rem;margin:0 0 5px}
.feature p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.5}

/* sticky sidebar */
@media(min-width:861px){.tool-layout .aside{position:sticky;top:78px}}

/* back to top */
.to-top{position:fixed;right:18px;bottom:18px;width:44px;height:44px;border-radius:50%;background:var(--accent);color:var(--accent-ink);border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .28s var(--ease),transform .28s var(--ease);z-index:60}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{filter:brightness(1.1)}
.to-top svg{width:20px;height:20px}

/* toast */
#toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(18px);background:var(--text);color:var(--bg);padding:11px 18px;border-radius:11px;font-size:.9rem;font-weight:650;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .25s var(--ease),transform .25s var(--ease);z-index:70;max-width:88vw;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* section reveal spacing */
.section{padding:34px 0}
.section-head{margin-bottom:20px}

/* reduced motion */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .js [data-reveal].in{animation:none!important}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}